| Class | StatusCount | A helper that stores the count of status for a list of items. |
| Function | get_status_counts | Return a list StatusCounts summarising the workitem. |
| Function | add_subscribe_link | Add the subscription-related links. |
| Class | MilestoneOverlayMixin | A mixin that provides the data for the milestoneoverlay script. |
| Class | RegistryDeleteViewMixin | A mixin class that provides common behaviour for registry deletions. |
| Class | RegistryEditFormView | A base class that provides consistent edit form behaviour. |
| Class | BaseRdfView | A view that sets its mime-type to application/rdf+xml. |
| Class | RDFIndexView | View for /rdf page. |
| Class | RDFFolder | Export the Launchpad RDF schemas. |